HST images of XDCP0044 and the region analyzed in this work. Left Panel: adapted from Travascio et al. (2020): HST RGB (F105W + F104W + F160W) image of XDCP0044 with overlaid the soft ([0.5−2] keV) bands X-ray contours. The yellow circle is centered on the X-ray extended emission centroid (yellow cross, RA = 00:44:05.2 and Dec = −20:33:59.8) and has a radius of 30 arcsec, corresponding to ∼250 kpc. The red circles mark the 5 X-ray point-like sources detected by Tozzi et al. (2014). Right Panel: HST image in F105W band. The yellow circles mark the sources detected in ground based HAWK-I J and Ks bands by Fassbender et al. (2014) while cyan circles mark the sources detected in HST. The magenta square is the KMOS field of view.